JPS62192051A - Reel base driving device - Google Patents

Abstract

PURPOSE:To obtain a stable set driving force in both a forward and a backward feedings, by providing a rotating member which keeps the same rotational direction even when the rotational direction of a reel driving means is varied, and is equipped with a slipping mechanism. CONSTITUTION:The driving force of a motor gear 11 rotating in arrow head direction is transferred to a main gear 14 with a roller contact arm 13. Since the slipping mechanism is arranged within the gear 14, a prescribed driving force is transferred to a gear 15. The driving force of the gear 15 is transferred to a reel base 7 at a take up side through a roller contact gear 19. The driving force of the gear 11 rotating reversely in arrow head direction is transferred to the gear 14 through the roller contact gear 13, and an intermediate gear 16. At such a time, the rotational direction of the gear 14 is set in the reverse direction of the gear 11. The prescribed driving force from the gear 14 is transferred to a reel base 8 at a supplying side through a roller contact gear 20, and an intermediate gear 9, etc. As a result, a stable prescribed set driving force can be obtained regardless of the rotational direction properties of the slipping mechanism, even in the forward and the backward feedings.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reel truck drive device used in video tape recorders and the like.

2. Description of the Related Art In general, in a reel stand drive device for a video tape recorder, the rotational speed of the reel stand changes depending on the difference in tape winding diameter during recording or playback.
A slip mechanism is provided in the drive transmission means that connects the motor and the motor, so that a constant driving force is transmitted. The structure of the slip mechanism is to press the friction plate onto the felt.
Slip between them is often used.

Hereinafter, a conventional reel stand driving device will be described with reference to the drawings. FIGS. 3 and 4 are plan views of the conventional reel stand drive device, and FIG. 3 shows the tape in the forward feeding state (υ).
FIG. 4 shows a reverse feeding state (reverse playback) in which the tape moves in the opposite direction to that shown in FIG. 3. In the figure, 1
2 is a belt that transmits the driving force of motor pulley 1; 3 is a pulley having an internal slip mechanism; 4 rotates coaxially with pulley 3; Pulley gear, 6
6 is a rolling contact arm that is rotatable around the rotation axis of pulley 3;
is a transfer gear that is disposed on the transfer arm 5 and meshes with the pulley gear 4, R is a reel stand on the take-up side, 8 is a reel stand on the supply side,
9.10 is an intermediate gear for transmitting the driving force to the supply reel stand 8.

The operation of the conventional reel stand drive device configured as described above will be described below. In FIG. 3, the driving force of motor pulley 1 rotating in the direction of the arrow in the figure is transmitted to pulley 3 by belt 2. In FIG. The pulley 3 has a built-in slip mechanism that presses the friction plate against the aforementioned felt, and is configured to transmit only a predetermined driving force to the pulley gear 4. The rotation of the pulley gear 4 causes the rotary contact arm 6 to rotate to the position shown in the figure, and the driving force of the pulley gear 4 is transmitted to the take-up side reel table 7 via the rotary contact gear 6.

Furthermore, when the motor pulley 1 rotates in the opposite direction to that shown in FIG. 3 as shown in FIG.
The driving force of the pulley gear 4 is transmitted to the supply side reel stand 8 via 1o.
is transmitted to. At this time, the tape is running in reverse (reverse playback)
becomes.

Problems to be Solved by the Invention However, in the above configuration, the clutch mechanism consisting of felt and friction plate is used both during forward and reverse feeds, and the rotation direction is changed. When the driving force of the clutch mechanism is set to the driving force of the take-up reel stand, the driving force of the supply reel stand does not become the set driving force during reverse feeding. Furthermore, if the driving force of the clutch mechanism is set to the driving force of the supply side reel stand during reverse feeding, there is a problem that the driving force of the take-up side reel stand does not become the set driving force during forward feeding. The cause of the discrepancy between the driving forces during normal feeding and reverse feeding is the inevitable rotational directionality of the felt itself.

Means for Solving the Problems In view of the above-mentioned problems, the present invention provides a drive transmission means for transmitting the driving force of the reel drive means for driving the reel stand to the reel stand, in which the direction of rotation of the reel drive means is changed. The device has at least one rotating member that maintains the same rotational direction even when the rotation speed of the IJ-ru base changes, and a slip mechanism is disposed in the rotating member to transmit a constant driving force even if the rotational speed of the IJ-ru base changes. It is something.

Function: By configuring the present invention as described above, there is no need to consider the direction of rotation of the felt, so that the set driving force can be stably obtained both during forward feeding and during reverse feeding.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show plan views of embodiments of the present invention,
FIG. 1 shows a forward feed state (recording or playback), and FIG. 2 shows a reverse feed state (reverse playback) in which the tape moves in the opposite direction to that in FIG. In addition, parts similar to those explained in the conventional example are given the same reference numerals, and duplicate explanations are omitted here. In the figure, 11 is a motor gear linked to a capstan motor (not shown). , 12 is a rolling contact arm that is rotatable around the rotation axis of the motor gear 11, 13 is a rolling contact gear that meshes with the motor gear 11 disposed on the rolling arm, 14 is a main gear having an internal slip mechanism, and 15 is a main gear. 14
16 is the main gear 14, which rotates around the rotating shaft as a fulcrum and outputs a predetermined driving force by the slip mechanism.
17.18 is a rotary contact arm rotatable about the rotation axis of the output gear; 19 and 20 are rotary contact gears disposed on the rotary arm 17.18 and meshed with the output gear 15; A slide plate 22 that slides in the direction of the arrow when changing between forward and reverse modes is a lever that is rotatable about a support shaft 22a. Note that 9a is the intermediate gear 9
, 1o.

The operation of the reel stand drive device of this embodiment configured as described above will be described below. In FIG. 1, the rotary arm 12 is rotated to the illustrated position by the motor gear 11 rotating in the direction of the arrow shown, and the rotary arm 12 is rotated to the illustrated position.
The driving force of the motor gear 11 is transmitted to the main gear 14. Since the above-mentioned slip mechanism is disposed inside the main gear 14, a predetermined driving force is transmitted to the output gear 15. The rotation of the output gear 16 causes the rotary contact arm 17 to rotate to the illustrated position, and the driving force is transmitted to the take-up reel stand 7 by the rotary contact gear 19. At this time, since the rolling contact arm 18 is urged to the illustrated position by the slide plate 21 as shown in the figure, the rolling contact gear 20 and the intermediate gear 9 do not mesh with each other. Also, as shown in Fig. 2, the motor gear 11
When the rotor is reversed to that shown in FIG. 1, the rotary arm 12 is rotated and the rotary gear 13 and intermediate gear 16 are engaged. The driving force of the motor gear 11 is provided by the rotary gear 13. The signal is transmitted to main gear 14 via intermediate gear 16 . At this time, main gear 1
4 is the same direction as in FIG. Slide plate 2
1 moves to the illustrated position, the rotary arm 18 becomes rotatable, the rotary gear 20 and the intermediate gear 9 mesh, and a predetermined driving force is transmitted to the supply reel stand 8. Further, the contact arm 17 is connected to the lever 2 rotated by the slide plate 21.
2 to the illustrated position, and the rolling gear 19 and the take-up reel stand 7 do not mesh with each other.

Effects of the Invention As is clear from the above explanation, according to the reel stand drive device of the present invention, even if the felt of the slip mechanism has a rotational directionality, the rotational direction of the felt is fixed both during forward feeding and reverse feeding. Since it is constant, an excellent effect can be obtained in that a predetermined driving force can be stably obtained.

[Brief explanation of drawings]

1 and 2 are plan views of one embodiment of the present invention;
This figure and FIG. 4 are plan views of the conventional example. 1...Motor pulley, 3...Pulley,
7... Winding side reel stand, 8... Supply side reel stand, 11... Motor gear, 12, 1
7.18...Relocation arm, 14...Main gear, 16...Output gear. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
figure

Claims (1)

[Claims] comprising a reel stand that fits with a reel in a cassette, a reel drive means for driving the reel stand, and a drive transmission means for transmitting the driving force of the reel drive means to the reel stand,
A reel stand driving device characterized in that the drive transmission means includes at least one rotating member that maintains the same rotational direction even if the rotational direction of the reel driving means changes and has a slip mechanism.